Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/14950
Title: Silica grafted polyethylenimine as heterogeneous catalyst for condensation reactions
Authors: Ribeiro, Sonia M. 
Serra, Arménio. C. 
Gonsalves, A. M. d’A. Rocha 
Keywords: Polyethylenimine; Silica; Heterogeneous catalysts; Knoevenagel condensation
Issue Date: 2010
Publisher: Elsevier
Serial title, monograph or event: Applied Catalysis A: General
Abstract: Primary amine groups were attached to a silica surface by using α,ω-diamines derivatives and (3-glycidyloxypropyl)-trimethoxysilane activation. The same activation was used to graft polyethylenimine, which also contains secondary and tertiary amine groups. These silica aminated structures were tested as heterogeneous catalysts in nitroaldol condensation with nitromethane, the derivative with the polyethylenimine moiety being the more active catalyst. This catalyst also showed efficiency in the Knoevenagel condensation of benzaldehydes with ethyl cyanoacetate under very mild reaction conditions and showed much the same efficiency when used in consecutive reaction runs. A reaction mechanism with participation of the several amine groups of the catalysts is discussed.
URI: http://hdl.handle.net/10316/14950
ISBN: 10.1016/j.apcata.2011.03.054
ISSN: 0926-860X
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

Files in This Item:
File Description SizeFormat
Silica grafted polyethylenimine.pdf378.05 kBAdobe PDFView/Open
Show full item record

Page view(s) 20

506
checked on Sep 17, 2019

Download(s) 50

260
checked on Sep 17, 2019

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.